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https://issues.apache.org/jira/browse/SPARK-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14012058#comment-14012058
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Michael Armbrust commented on SPARK-1959:
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If all the hive tests still pass with that line removed then I'm okay with it.
> String "NULL" is interpreted as null value
> ------------------------------------------
>
> Key: SPARK-1959
> URL: https://issues.apache.org/jira/browse/SPARK-1959
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.0.0
> Reporter: Cheng Lian
>
> The {{HiveTableScan}} operator unwraps string "NULL" (case insensitive) into
> null values even if the column type is {{STRING}}.
> To reproduce the bug, we use
> {{sql/hive/src/test/resources/groupby_groupingid.txt}} as test input, copied
> to {{/tmp/groupby_groupingid.txt}}.
> Hive session:
> {code}
> hive> CREATE TABLE test_null(key INT, value STRING);
> hive> LOAD DATA LOCAL INPATH '/tmp/groupby_groupingid.txt' INTO table
> test_null;
> hive> SELECT * FROM test_null WHERE value IS NOT NULL;
> ...
> OK
> 1 NULL
> 1 1
> 2 2
> 3 3
> 3 NULL
> 4 5
> {code}
> We can see that the {{NULL}} cells in the original input file are interpreted
> as string {{"NULL"}} in Hive.
> Spark SQL session ({{sbt/sbt hive/console}}):
> {code}
> scala> hql("CREATE TABLE test_null(key INT, value STRING)")
> scala> hql("LOAD DATA LOCAL INPATH '/tmp/groupby_groupingid.txt' INTO table
> test_null")
> scala> hql("SELECT * FROM test_null WHERE value IS NOT NULL").foreach(println)
> ...
> [1,1]
> [2,2]
> [3,3]
> [4,5]
> {code}
> As we can see, string {{"NULL"}} is interpreted as null values in Spark SQL.
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